misc/lldb_yjit.py

   1 #!/usr/bin/env python
   2 #coding: utf-8
   3 #
   4 # Usage: run `command script import -r misc/lldb_yjit.py` on LLDB
   5 #
   6
   7 from __future__ import print_function
   8 import lldb
   9 import os
  10 import shlex
  11
  12 def list_comments(debugger, command, result, internal_dict):
  13     target = debugger.GetSelectedTarget()
  14     process = target.GetProcess()
  15     thread = process.GetSelectedThread()
  16     frame = thread.GetSelectedFrame()
  17
  18     # Get the different types we need
  19     rb_darray_meta_t = target.FindFirstType("rb_darray_meta_t")
  20     codeblock_t = target.FindFirstType("codeblock_t")
  21     yjit_comment = target.FindFirstType("yjit_comment")
  22
  23     # Get the global variables we need
  24     comments = target.FindFirstGlobalVariable("yjit_code_comments")
  25     cb = target.FindFirstGlobalVariable("cb").Cast(codeblock_t.GetPointerType())
  26
  27     # Get the address of the memory block we're using
  28     mem_addr = cb.GetChildMemberWithName("mem_block").GetValueAsUnsigned()
  29
  30     # Find the size of the darray comment list
  31     meta = comments.Cast(rb_darray_meta_t.GetPointerType())
  32     size = meta.GetChildMemberWithName("size").GetValueAsUnsigned()
  33
  34     # Get the address of the block following the metadata header
  35     t_offset = comments.GetValueAsUnsigned() + rb_darray_meta_t.GetByteSize()
  36
  37     # Loop through each comment and print
  38     for t in range(0, size):
  39         addr = lldb.SBAddress(t_offset + (t * yjit_comment.GetByteSize()), target)
  40         comment = target.CreateValueFromAddress("yjit_comment", addr, yjit_comment)
  41         string = comment.GetChildMemberWithName("comment")
  42         comment_offset = mem_addr + comment.GetChildMemberWithName("offset").GetValueAsUnsigned()
  43         print("%0#x %s" % (comment_offset, string.GetSummary()), file = result)
  44
  45
  46 def __lldb_init_module(debugger, internal_dict):
  47     debugger.HandleCommand("command script add -f lldb_yjit.list_comments lc")